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238U (t1/2 = 4.5×109 yr) begins a decay series that ultimately forms 206Pb. The scene below depicts the relative number of 238U atoms (red) and 206Pb atoms (green) in a mineral. If all the Pb comes from 238U, calculate the age of the sample
238U (t1/2 = 4.5×109 yr) begins a decay series that ultimately forms 206Pb. The scene below depicts the relative number of 238U atoms (red) and 206Pb atoms (gre

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  • Pada peluruhan radioaktif berlaku:
    Ln (At/Ao) = -kt
    Ln (1/2) = -k t{1/2}
    k = 0.693/t{1/2} = 0.693 / (4.5 × 10^9) = 1.5403 × 10^-10 year^-1

    Merahnya ada 9, ijonya ada 6, berarti

    Ln(9/15) = -k t
    t = Ln(9/15) ÷ (-k)
    t = -0.5108 ÷ (-1.5403 × 10^-10)
    t = 3.3164 × 10^9 year

    jd sampelnya berumur 3.3164 × 10^9 tahun

    TERALAT

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